Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air occupies space Air is matter Air is a gas. Air has mass None 2. What process replenishes the atmosphere with oxygen? Oxygen Cycle Both A and C Water Cycle Photosynthesis None 3. Which is the most abundant gas in our atmosphere ? Nitrogen Carbon monoxide Oxygen Carbon dioxide None 4. Carbon dioxide constitutes nearly ___ % of the atmosphere. 45 0.03 78 28 None 5. What is the major constituent of air Water vapour Hydrogen Nitrogen Oxygen None 6. Combustion can not take place without: water carbon zinc Air None 7. Air is regarded as a mixture because: its composition may vary its temperature may change its volume changes under different conditions its pressure may vary None 8. The correct ascending order of gases as per their composition in air is: nitrogen < hydrogen < oxygen oxygen < carbon dioxide < hydrogen oxygen < carbon dioxide < nitrogen hydrogen < oxygen < nitrogen None 9. Glass panes usually appear hazy because: it is the property of transparent substances they are old. None water vapour settling on the tiny dust particles. None 10. Which of the following gases do not form part of the atmosphere? Oxygen Chlorine Nitrogen Carbon idoxide None 11. Which one of the following gas does not form a part of the atmosphere? Chlorine Nitrogen Carbon dioxide Oxygen None 12. It is not proper to breathe through our mouth because: we will catch cold easily the dust particles would enter our bodies our throat will become sore more carbon dioxide will be inhaled None 13. Air has________ composition with________ oxygen at high attitudes. fixed, more variable, more variable, less fixed, less None 14. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (i) and (iii) (i) and (ii) (i), (ii) and (iii) (ii) and (iii) None 15. A greenhouse gas that absorbs energy and maintains earth's temperature is: nitrogen oxygen carbon dioxide argon None 16. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. Air shows properties same as the constituent gases present in it. All of the above Air does not have a fixed formula like compounds. It is possible to separate air into its constituent gases by physical methods like fractional distillation. None 17. Which of the following gases burns in air Carbon monoxide Helium Nitrogen Carbon dioxide None 18. Carbon exists in the atmosphere in the form of: carbon monoxide in traces and carbon dioxide coal carbon dioxide only carbon monoxide only None 19. __________ is the most abundant gas in the atmosphere. Nitrogen None of the above Carbon dioxide Oxygen None 20. The percentage of nitrogen and oxygen in air is: 50% by weight 37% by weight 99% by volume 21% by volume None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
